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State Water Board adopts statewide on‑site nonpotable reuse regulations under SB 966
Summary
The board voted unanimously to adopt risk‑based building‑scale on‑site nonpotable reuse regulations required by SB 966, setting treatment trains, notification and commissioning obligations for local permitting and leaving primary implementation to local jurisdictions.
The State Water Resources Control Board on Tuesday adopted statewide regulations implementing Senate Bill 966 that set health‑protective, risk‑based standards for on‑site treatment and reuse of nonpotable water in multifamily residential, commercial and mixed‑use buildings.
The board’s action, approved by roll call, inserts criteria into California’s water recycling framework to govern graywater, roof‑runoff and certain stormwater and on‑site wastewater systems used for nonpotable end uses at the building scale. Chair Joaquin Esquivel said the rules are intended to expand options for local jurisdictions while protecting public health and aligning with other state priorities.
Staff described a multi‑year development process that began after SB 966 (2018) and included an external scientific peer review of pathogen log‑reduction targets, several public comment periods and targeted revisions. Shirley Rosalella, the staff lead, said the final text provides a prescriptive set of approved pathogen‑control…
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